package web.servlet5;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.mail.Session;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import model.Book;
import model.Category;
import model.Product;
import sevice.ProductService;
import sevice.ServiceDAOFactory;

@WebServlet("/main.do")
public class MainServlet extends HttpServlet {
	private static final long serialVersionUID = 4203324038024016589L;

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		doPost(req, resp);
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		String method = req.getParameter("method");
		HttpSession session = req.getSession();
		Map<String, List> datas = new HashMap<String, List>();
		if (method != null) {
			switch (method) {
			case "1":
				productDetail(req, resp);
				break;
			default:
				break;
			}
		} else {
			initCategory(datas);
			initRecommed(datas);
			initHotBooks(datas);
			initNewBooks(datas);
			req.setAttribute("datas", datas);
			req.getRequestDispatcher("/WEB-INF/view/home/main.jsp").forward(req, resp);

		}

	}

	private void productDetail(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		Book book = null;
		try {
			String id = req.getParameter("id");
			if (id != null) {
				book = (Book) ServiceDAOFactory.getProductService().findById(new Integer(id));
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		req.setAttribute("book", book);
		req.getRequestDispatcher("/WEB-INF/view/home/product.jsp").forward(req, resp);

	}

	private void initCategory(Map<String, List> datas) {
		List<Category> cats;
		try {
			List<Category> list = ServiceDAOFactory.getCategoryService().findAll();
			cats = findByParentId(list, 1);
			//
			for (Category c : cats) {
				c.setSubCats(findByParentId(list, c.getId()));
			}
			datas.put("category", cats);
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

	private List<Category> findByParentId(List<Category> list, int id) {
		List<Category> subCats = new ArrayList<Category>();
		for (Category c : list) {
			if (c.getParentId() == id) {
				subCats.add(c);
			}
		}
		return subCats;
	}

	private void initRecommed(Map<String, List> datas) {
		List<Book> productList = new ArrayList<Book>();
		ProductService productService = ServiceDAOFactory.getProductService();
		try {
			productList.add(productService.findById((int) (Math.random() * 20) + 1));
			productList.add(productService.findById((int) (Math.random() * 20) + 1));
			datas.put("books", productList);
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

	private void initHotBooks(Map<String, List> datas) {
		List<Book> books = new ArrayList<Book>();
		List<Product> pros;
		try {
			pros = ServiceDAOFactory.getProductService().findByHot(2);
			for (Product p : pros) {
				books.add((Book) p);
			}
			datas.put("hotBooks", books);
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

	private void initNewBooks(Map<String, List> datas) {
		List<Book> books = new ArrayList<Book>();
		List<Product> pros;
		try {
			pros = ServiceDAOFactory.getProductService().findByNew(4);
			for (Product p : pros) {
				books.add((Book) p);
			}
			datas.put("newBooks", books);
		} catch (Exception e) {
			e.printStackTrace();
		}

	}
}
